Lathe tool support



Oct. 3, 1950 E. E. JOHNSON LATHE TOOL SUPPORT 2 Sheets-Sheet 1 FiledNov. 25, 1947 FIG. 1.

, INVENTOR. ERNEST E. uo/m/so/v,

ATTORNEYS.

Oct. 3, 1950 E. E. JOHNSON LATHE TOOL SUPPORT 2 Sheets-Sheet 2 FiledNov. 25, 1947 INVENTOR. ERNEST E. uox/ms'o/w ATTOAIVE Y5.

Patented Oct. 3 1950 UNITED STATES FATENT OFFICE LATHE TOOL SUPPORTErnest E. Johnson, Jamestown, Ind. Application November 25, 1947, SerialNo. 787,983 I 4 Claims.

This invention relates to improvements in lathe tool supports, and moreparticularly to an adjustable support for a boring bar or similar tool.

It is among the objects of the invention to provide an improved toolsupport adapted to be mounted on the compound slide Or rest of aconventional lathe for rotational adjustment about an axis substantiallyat right angles to the axis of rotation of the lathe chuck or spindle,and movable along the bed, cross-Way and compound slideway of the lathe,and including means operative for eccentric adjustment of the toolrelative to said rotational axisof the lathe chuck for accuratepositioning of the tool relative to a Work piece supported in the chuck,and for boring, chamfering, grooving and facing said Work piece atdesired angles.

A further object resides in the provision of improved guideway engagingmeans for quickly and securely looking a tool support on the compoundslide of a lathe, of means independent of such locking means forsecurely clamping the tool in any desired position of eccentricadjustment in said support, and of means independent of both saidlocking and said clamping means operative to hold said support in anydesired position of rotational adjustment about an axis disposed,

substantially at right angles to the rotational axis of the lathe chuck.

A still urther object resides in the provision of a lathe tool holderincluding independent means providing for movements of adjustment ofsaid tool eccentrically of the rotational axis of the lathe chuck,rotationally about an axis substantially at right angles to suchrotational axis, and translatory of the lathe compound slide guideway,and separate locking means for securing said tool in any desiredpositionof adjustment in all of the three different ranges of adjustablemovements.

An additional object resides in the provision of an improved lathe toolholder which is simple and economical in construction, may be attachedto a conventional lathe without modification of any part of thelatheQprovides at least three ranges of adjustable movement for. a toolsup ported thereby, is simple to install and easy to adjust, and isefiective to firmly hold-thetoolin adjusted position during operation ofthe lathe.

Other objects and advantages will become apparent from a considerationof the following description in conjunction with the accompanyingdrawings, wherein:

Figure 1 is a topplan view ofja fragmentary portion of a conventionallathe showin the anof the invention;

Figure 2 is a top plan view on a somewhat enlarged scale of the toolsupport illustrated in Figure l, the lathe tool itself being omittedfrom the assembly;

Figure 3 isa side elevation of the tool support illustrated in Figure 2;v

Figure 4 is a side elevation of the tool support substantially at rightangles to the side elevation shown in Figure 3, and looking at theright-hand side of the tool support as illustrated in Figure 3;

Figure 5 is a transverse cross-section of a fragmentary portion of thetool support illustrated in Figure 3, taken substantially on the line 55of Figure 3;

Figure 6 is a transverse cross-section of an eccentric sleeveconstituting a component of the support illustrated in Figure 3, andtaken substantially on the line 66 of Figure 3;

Figure '7 is a top plan View of the base component of the tool supportillustrated in Figures 3 and 4;

Figure 8 is a top plan view of a splitnut secured to the base; 7

Figure 9 is an end elevation of the split nut;

Figure 10 is a side elevation of the split nut;

Figure 11 is a longitudinal crossesection of the slide groove blockassembly shown at the bottoms of Figures 3 and 4, and takensubstantially on the line ll-ll of Figure 4, and

Figure 12 is a fragmentary, transverse crosssection taken substantiallyon the section line |2l2 of Figure 2.

With continued reference to the drawings, and

particularly, to Figure 1, the portion of the lathe illustrated includesa longitudinal lathe bed H3 upon which is mounted a cross-way H movablelongitudinally of the lathe bed by conventional screw shafts or othermeans, not illustrated, and

pound slide M, and a lathe chuck l5 driven by conventional means, notillustrated, to rotate about a rotational axis extending longitudinallyof the lathe bed Ill.

The compound slide 14 is movable lengthwise of the guide l3 by suitablemeans including the rotatable handle l6 and is provided with atransverse guideway slot l! of conventional dovetailor invertedT-shaped' cross-section. The compound slide is rotatably mounted on thetop of the transverse slide l2 and may be turned f to any desiredrotational position relative to the transverse slide and the lathe bedl8.

In the arrangement illustrated, the lathe is set up for internallyboring a work piece 18 held in the chuck l5. A suitable cutting tool isis carried by a boring bar 20 which is supported in a tool supportmounted on the compound slide l and generally indicated at 2|.

As will be later described, in detail, the tool support 2| is soconstructed and arranged that the tool may be positioned to bore, face,chamfer and groove the work piece 38 at any desired angle upon movementof the compound slide 14, or the transverse slide l2, or both thecompound and transverse slides, as may be found necessary.

As is most clearly illustrated in Figure 4, the

tool support comprises a, base-i2, illustrated.

in detail in Figure '7, a cylindrical body 23, a. split sleeve 25carrying an eccentric tool-receiving bore extending longitudinallytherethrough, a clamping plate 25', a mounting block 26, a split nut 21,and a locking bolt 28.

The base 22 is a flat, plate-like member having substantially paralleltop and bottom surfaces and a substantially circular planiform shape,one side of which is flattened, as indicated at 29, for the attachmentthereto of the split nut 2?. The base plate has a centrally located,generally cylindrical boss extending from one side thereof and providedwith a diametrically-transversc tapered hole SI, and a centrallylocated, cylindrical stud 32 projecting from the opposite or top surfacethereof. angularly-spaced. internally screw-threaded holes 33circumferentially arranged about the stud 32 for a purpose which willpresently appear.

The split nut 21 comprises a pair of substantiall L-shaped halves 34-provided with semicylindrical, internally screw-threaded recesses whichform, when the two halves are operatively associated, an internallyscrew-threaded aperture 35 extending longitudinally through thenutsubstantially parallel to the bottom surface of base plate 22. Each half34 of the split nut comprises a substantially rectangular portion havingan apertured rectangular lug 3E upstanding at one end thereof which lugsoverlie the flattened surface 29 of the base plate, as is clearlyillustrated in Figures 3 and 4, and are secured thereto by respectivescrews 31 passing through the lugs and into screw-threaded wellsextending inwardly from the flattened edge portion of the base plate.The halves of the split nut are further secured to the base plate byscrews passing respectively through holes 38 in the base plate andcorresponding holes 39 in the nut halves and dowels extending throughholes 40 in the base plate between the two holes of, each pair of holes38 and through corresponding holes 4| in the, nut halves, the varousvscrews and the dowels rigidly securing the split nut to the base,

plate so that the rectangular portion of the nut halves underlie thebase plate and are held together to provide the screw-threaded opening"35 for the locking bolt 28.

A slide block 42. is provided with a central. aperture receiving theboss BOdepending from the bottom surface ofthe base plate, with onposite'fianges 43 respectively engagingthe opposite uppenedge, portions of theguideway groove [7 in the compound slide 14 and with tapered hcles whichregister with the tapered hole 3| in the boss 39.

The locking. boll- 28 hasa It also has a plurality of r1ad 44 provided"with wrench or tool-engaging means 45 which" may be in the form of anon-circular socket in the head, an externally screw-threadedcylindrical portion 46 adjacent the head and received in the split nut27 and a tapered portion A! at the end of the screw-threaded portionopposite the head. The tapered portion is received in the tapered holesin the block 26 and boss 3!] and is operative, when the bolt is threadedinwardly through the nut 27 to displace the block 26 relative to theboss-36' in a manner to clamp the opposite upper-edge portions of theguideway groove I1 between the block flanges 42 and the bottom surfaceof the base plate 22 to thereby lock the tool support to the compoundslide in any desired translatory position of the tool supportlengthwiseof the guideway groove H.

The body 2 3.is preferably in the form of a right cylinder havingparallel top and bottom surfaces, the bottom surface engaging the topsurface of the base plate 22 and having a centrally-located recess;therein receiving the stud 32. A pair of, elongated, arcuate slots (48extend through'thebody'23 from the top to the bottom surface thereof andat spaced-apart, diametrically-opposedpositions, as is clearlyillustrated in Figure 2. These slots may have their upper endssurrounded by bearing ridges 49 and respective bolts 59 extend throughthe slots and are threaded at their bottom ends into corresponding holes33 in thebase plate 22 tosecure the body 23 to the base plate, thesebolts having at their upper endsheads" which overlie the ridges 49 andare provided'with respective wrench-receiving' sockets 5|.

As illustrated in Figure'2', the slots t8 have a length corresponding tothe spacing of holes 33 in a manner such that'the'slots extend over twomore of the holes which renders it possible to rotate the body '23through 330 degrees or a complete revolution relative to the base 22 andsecure the body to' the base inany position of adjust ment within such acomplete revolution. The body 23' is provided-around its bottom end withdegree marks and the base base reference mark which cooperates'withthedegree marks to indicate the --an-gular position of body 23, relativeto base 22.

The body-23 is further provided with a transverse or diametrical bore 52havinga cylindrical portion of circular cross-sectional shape and anextension 53 at the upper-side thereof which extension has a rectangularcross-sectional shape and provides a recess extending transverselythrough the body at the top of the cylindrical portion of the bore, acounter-bored aperture 54 centrally located in the top of the body andextending from the top surface into the recess 53, and a pair of.internally screw-threaded openings 55 0f circular'cross sectionextending from the top surface of the body to the recess 53 and disposedin diametrically-opposite position one at each side of said openings 55and between adjacent ends of said slots 48.

The. tool-holding sleeve 24. is inithe form of a right cylinder havingan outside diameter sub-- stantially equal to the diameter of ,thecylindrical portion of bore, 52 so that the. sleeve is slidably receivedin the bore. This sleeve is lon v gitudinally divi ldedinto twosubstantially equal parts and is provided with a longtiudinal tool- Ireceiving boreifi, the longitudinal center-line of which is spaced'fro'mthe longitudinal center-line of the sleeve ,to provideaneccentricmounting for-the tool in the bore of body 23.

The two parts of the sleeve are held together 7 1 by a pair ofspaced-apart screws 51, each of which extends through an opening 58 inone part of the sleeve which opening has a counterbore in each endthereof, and is threaded into an internally screw-threaded opening 59 inthe other half of the sleeve which opening is provided with acounterbore in the inner end thereof. The screw head is disposed in theouter counterbore of the opening 58 and a coiled compression spring 60surrounds each screw within the adjoining counterbores of the openings58 and 59 to resiliently urge the two'parts of the sleeve apart.

The screws 51 are adjusted so that the sleeve maybe entered into thebore in the body 23 andso that the springs 55 will force the oppositesides of the sleeve into frictional engagement with the surface of thebore to frictionally hold the sleeve in the bore.

A'clamping plate 69 is received in the recess 53 of the bore 52, and hasa concave surface opposed to the adjacent surface portion of sleeve 24.Respective screw plugs 6| threaded into the opening 55 bear at theirinner ends on the top surface of this clamping plate to force it againstthe split sleeve to thereby clamp the sleeve in the bore of the body 23and also rigidly clamp the boring bar 28 in the tool-receiving bore 56of the sleeve, holding the sleeve in any desired position of eccentricadjustment in the bore 52.

A bolt 62 extends through the counterbored openings 54 inthe top portionof body 23 with its head in the counterbore, and is threaded at itslower-end'into a screw-threaded aperture 63 provided in; the plate 55centrally thereof. In additionto its head, this bolt is provided with ashoulder 64 which bears upon the top surface of the plate and a coiledcompression spring 65 surrounds the bolt within the counterbore betweenthe bottom of the counterbore and the bolt head to resiliently urge theplate against the upper surface of the recess 53, the bolt and springacting to retain the plate 5E1 in the recess when the sleeve 24 isremoved from the body 23.

lri operation, the compound slide 14 of the lathe is set to the desiredangular relationship to the transverse slide 12, the tool 20 is insertedin the sleeve 26 and the sleeve is inserted in the body 23 which is, inturn, mounted upon the base 22, secured to'the compound slide I4 byengagement of the block 26 in the guideway slot 11 of the compoundslid-e. The body 23 is then brought to a condition of approximaterotational adjustment relative to the base 22 and the entire support ismoved along'the groove ll until the tool I 9 is brought substantially tothe desired position relative to the work piece H3. The locking bolt 28may then be tightened, moving the block 26 relative to the boss 35 tolock the base in the desired position along the guideway slot IT. The

rotational adjustment between the body 23 and the base 22 is thenperfected and the bolts 50 are tightened to hold the body 23 in thedesired position of rotational adjustment upon the base. The tool shaftor bar 20 may now be rotated in the sleeve to bring the cutting point ofthe tool to the desired position, and, if necessary, the sleeve 24 maybe rotated in the body 23 to eccentrically adjust the tool relative tothe supporting body, after which the plugs 6| are tightened down on theclamp plate 60 to rigidly clamp the sleeve and boring bar in the body 23against movement relative thereto.

The improved support thus provides three different ranges of adjustablemovement for the tool [9 and, in fact, a fourth range which may beaccomplished by moving the bar 20 lengthwise through the sleeve 24, andthe support is locked in adjusted position in each of these three rangesof adjustable movement by separate and independent locking means, anyone of which may be loosened for adjustment of the tool in thecorresponding range of movement without loosening the locking meanscorresponding to the other two ranges of adjustable movement, or in anyway disturbing the adjustment of the tool in the other two ranges. Thetool can thus be brought to a condition of adjustment relative to thework piece of micrometer accuracy and securely locked in such adjustedposition, and is movable, upon movement of the compound slide la in thedesired direction, to face, chamfer, or groovethe work piece, as may bedesired.

Figure 12 illustrates a locking pin construction for releasably securingsleeve 24 in a medial posi tion in which the sleeve axis and the axis ofbore 56 are both in a substantially horizontal plane. Tool support 2|has an aperture 10 extending from the top surface thereof to the base 52between center bolt 52 and one of the clamping bolts 6!, and through theclamping plate 25. As illustrated, one side of the split sleeve 24 isprovided with a well or recess 1 l, or with a series of such apertures,centered in a plane perpendicular at the axis of the sleeve to-a planeincluding the axis of "sleeve 24 and bore 56. The opposite side of thesplit sleeve may, however, be provided with a similar recess or withsimilar recesses, if desired. 5 1pm 12 is slidably received in apertureH! and has its inner end receivable in recess H in sleeve 24 to hold thesleeve in the above-described position for certain boring, reaming,threading and similar operations. The pin is provided on its upper endwith a head 13 by means of which it may be raised to remove its lowerend from recess II, when desired.

The invention may be embodied in other specific forms without departingfrom the spirit or essential characteristics thereof. The

present embodiment is, therefore, to be considered in all respects asillustrative and not restrictive, the scope of the invention beingindicated by the appended claims rather than by the foregoingdescription, and all changes which come within the meaning and range ofequivalency of the claims are, therefore, intended to be embracedtherein. I

What is claimed is:

l. A lathe tool support comprising a flat base .1 having a centrallylocated boss extendingfrom mounted on said base and having a pair ofoppositely disposed, arcuate slots extending longitudinallytherethrough, and a cylindrical bore extending diametricallytherethrough between said slots, a respective bolt extending througheach slot and threaded into a hole in said base, said bolts holding saidbody in any desired position of rotational adjustmentupon said base, aflanged block having a central aperture receiving said base boss andslidably received in a guideway slot in a lathe slide, said block havingtapered holes therein registering with the hole in said boss, aninternally screw-threaded nut secured to said base, and a locking bolthaving a screwthr-eaded portion received in said nut and a taperedportion received in the tapered holes in saidblock relativettosaidl bossto lock said tool.

supportrelativexto a; latheslide upon which the tool. support ismounted, said cylindrical body having arecess of generally rectangularcrosssection at one side of and extending along said diametrical bore, avcounter-bored central opening in the top thereof opening into saidrecess, and a pair-of internally screw-threadedholes extending? from thetopthereof'into said recess andv disposed one. at each side of saidcentral opening, a split, cylindrical sleeve in said, bore supporting alathetool eccentricallyof the longitudinal centerline of said bore, aclamping plate extending through; saidrecess: having, a concave surfacecontacting saidsleeve, and; a centrally-located well thereim. a. boltinsaid central. opening threaded inte said \vellandhavinga head in saidcounter-bore, a; spring between the bottom of said counter-bore and thehead of.- said bolt resiliently urging said clamping plate toward .theouter side of said recess; and a-set screw in each of said internallyscrew-threaded-holes.bearing against said clamping plate and forcingsaid clamping; plate against said sleeve to thereby clamp said sleeveand said tool in adjusted position in said cylindrical body.

2.111 the combinationofa lathe slide having a guideway groove therein,and a tool-supporting body mounted onsaid slide means operative to locksaid body in adjusted; position along said groovecomprising a. bossdepending fromsaid body into said groove, and having a tapered holeextending transversely therethrough; a block having a central aperturereceiving said boss, flanges slidable in, thev opposite sides of saidgroove, and tapered. holes registering withthe tapered holein said boss;aninternally screwthrea'ded, split n-ut secured; to said .body andreceived in saidgroove; and a'locking bolt having a screw-threadedportion receivedin said nut.v

and a tapered portion extending,v through said tapered holes and.operative to displace said block relative .tozsaid bod to clamp the sideedges of said groove between saidblock and said body.

3. A lathe-tool support comprising. a fiat base having a centrallylocated boss on one side, a centrally located. stud on the oppositeside, and a plurality of-angularlyspaced, internally screwthreaded holescircumferentially arranged about said stud; abody having abaseeengaging. surface and a central recess in said surface receiving.said stud, a pair of spaced apart, oppositely disposed, arcuate slotsextending therethrough perpendicular to said surface, a tool-receivingboreextending. transversely therethrough between said slots,

a top surface iopposite said base-engaging surface, and a pair. ofinternally screw-threaded.

holes extending from. said top surface to. said bore and locatedrespectively between adjacent ends of saidslots for receiving set screwsforclamping a tool in said tool-receiving bore; and,

respective bolts-extending through said slots in said body and threadedinto said holes insaid base-to secure said body to said base, the lengthof saidslots and-the spacing ofsaid holes providing. for rotationalpositioning of said body relative to said base in. any desired positionwithin acomplete revolution.

4, A latheetool support comprising a body having ,top and bottomsurfaces, a-bore extending transversely therethrough and including acylindrical portion. and a rectangular recess extending through saidbody at the top of said cylindrical.

also having anaperture. extending from the top. surface thereof into,said transverse bore. and.

saidsleeve having inone side thereof a recess alignable with saidaperture, a pin slidably re-.

ceivcd in said aperture with its lower end engageable in said; recesstoholdsaid sleeve in a predetermined position in said body, and a headonthe upper end of. said pin for lifting it out of engagement with saidrecess.

ERNEST E. JOHNSON.

REFERENCES CITED The following references-are of recordv inthe file ofthis patent:

UNITED STATES PATENTS a longitudinally split cylindricalv

